The possibility of selecting the gas meter material from among 5 different excellent materials (polyvinyl chloride (PVC), polypropylene (PP) polyvinylide fluoride (PVDF), PE-el (polyethylene electrically conductive) or refined stainless steel 1.4571 (316L) enables the user individually to meet measurement requirements even in case of highly aggressive gases.
For rugged, industrial applications, robust models with a stainless steel casing and plastic drum (four different materials) are available.
The desired measurement range can be selected from among 9 magnitudes (types) extending as a whole from 0.1 ltr/h to 18,000 ltr/h at a gas temperature ranging from -50 to +120oC. The solidly manufactured casing of the standard meters is designed to withstand a maximum over pressure of 50 mbar (plastic casings) or 500 mbar (stainless steel casings); meters for higher pressure ranges up to 16 bars are available.
The measurement of RITTER drum type gas meters works on the principle of displacement. The gas meters contain a revolving measuring mechanism (measuring drum) within a packing liquid (usual: water or thin bodied oil). The measuring drum compulsorily measures volume by periodically filling and emptying four rigid measuring chambers.
Fastidious production methods and calibration enable a measuring accuracy of + 0.2% at standard flow rate and approx. + 0.5 per cent over the whole measuring range.
The major advantage and the superiority o volumetric Gas Meters (like Drum type Gas Meters) over other measurement principles, which determine gas volume using secondary measurable variables such as speed, heat capacity, hot wire resistance or similar, is that the volume is directly measured. That means that the condition and the composition of the gas has no influence on t he measurement accuracy.
Correcting factors which take into account gas type, temperature, humidity etc are therefore not necessary. It should be noted that with other, non volumetric measurement processes, the measurement accuracy given for that process can only be achieved if the correcting factors for the immediate condition of the gas are exactly known.
- 4-Chamber Measuring Drum
- Magnetic Coupling (between the measuring drum and counting mechanism)
- 8-digit Totalizing Roller Counter
- large, one-Needle dial
- Filling-level Indicator (for setting the Packing Liquid level)
- Manometer/Thermometer Supports
- Viton sealing
- Level; and Levelling Feet.
- Maximum gas inlet pressure (overpressure):
50 mbar with plastic casings
500 mbar with stainless steel casings
- Measuring accuracy: ± 0.2 per cent at standard flow rate (exact value is stated in individual Calibration Certificate),approx ± 0.5 per cent over the measurement range
For further information about Gas Flow Meters visit Ross Brown Sales at http://www.rossbrownsales.com.au
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